* cfgloopanal.c (variable_initial_value, variable_initial_values,

	* cfgloopanal.c (variable_initial_value, variable_initial_values,
	simple_loop_exit_p): Record the fact that initial value is extended
	from inner mode.
	(count_strange_loop_iterations, count_loop_iterations): Handle
	ivs that iterate in a narrower mode. Fix handling of overflows.
	Improve handling of NE conditions.
	(inverse, fits_in_mode_p): New static functions.
	(simple_increment): Detect variables that iterate in a narrower mode.
	* cfgloop.h (struct loop_desc): Fields inner_mode and extend added.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@73275 138bc75d-0d04-0410-961f-82ee72b054a4